Consider the two-dose vaccines from Pfizer and Moderna, found to be about 95% effective at preventing illness. Studies for those shots counted a COVID-19 case whether it was mild, moderate or severe and were conducted before worrisome mutated versions of the virus began circulating.
Then Johnson & Johnson tested a single-dose vaccine and didn t count mild illnesses. J&J’s shot was 66% protective against moderate to severe illness in a large international study. In just the U.S., where there s less spread of variants, it was 72% effective. More importantly, once the vaccine’s effect kicked in it prevented hospitalization and death.
Credit: AP
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